coal mine Articles
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Comparison of Gas and Water Pycnometry of Coal Mine Wastes
Coal mine washery wastes comprise two major components whose specific gravities differ markedly. Consequently, their specific gravity is much more variable than that of natural soils and is determined relatively frequently. The specific gravity of coal mine wastes is determined more rapidly and efficiently by gas pycnometry than by water pycnometry. However, the two methods give significantly ...
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Hours of work risk factors for coal mining
This paper considers the principal variations in accident and incident risk in relation to roster design within the Australian coal mining industry. Analysing industry-wide accident and incident statistics for both a wide range of coal mine operating conditions and different roster patterns allowed for the impact of hours on shift, number of successive shifts and the type of shift to be ...
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Investigation in to the causes of severe roof problems in some Indian coal mines and formulation of guidelines to reduce ground control problems
Severe roof stability problems are encountered in many of the Indian Coal Mine the cause of which could not be understood properly and thus no preventive measure could be taken. The discontinuous and random roof failure in the same stretch of level galleries/dip rises under the same geological conditions defied any logic. Actual stress measurement in two mines having such problems revealed ...
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Coal Mining – understanding your resource
Geovista have just come back from India – what a beautiful country! Training and commissioning was completed for two full systems involved in the exploration and development of the country’s coal and mineral resources. Focus was provided on the operation, maintenance and running of the Geovista equipment with two trips completed to the field. A great success with great ...
By GeoVista
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Assessment of severe accident risks in the Chinese coal chain
Severe accident risks in China's coal chain were investigated in detail based on extensive statistics using Chinese sources that were not open until recently. Every year about 6000 fatalities occur in Chinese coal mines; about one third due to severe (≥ five fatalities) accidents. The Chinese severe accident fatality rate for the coal chain is 6.17 per GWeyr, which is about 10 times higher than ...
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Ghost Series Enclosed Combustor AB-200 - Case Study #170403
PROJECT DETAILS Location: RockyMountains FlowRate: 1.75MMSCFD InletPressure: 9”WC Heating Value: 227 BTU/SCF Application: Coal Mine Methane Recovery Aereon’s GHOST Series Enclosed Combustor AB-200 was purchased by the client to recover methane from an abandoned coal mine in order to earn hydrocarbon credits. Prior to incinerating the gas, methane was simply venting to the ...
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Downsizing through technology management and outsourcing: a case study of a captive coal-mining organisation in India under globalisation
The organisation under discussion is a part of a Steel Company and consists of a group of captive underground coal mines required to produce coking coal, wash it in the coal washeries (benefitiation plants) and send the good quality clean coal to the steel plant for steel-making. The emergence of liberalisation in India has affected Indian industries and compelled them to think of ways to become ...
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Coal sorption characteristics and coal surface tension
Underground coal mining in the Bulli Seam of Sydney Basin, Australia encounters the problems of coal and gas outburst as the coal contains high concentration of CO 2 , where certain parts of the seam have been found to be especially hard-to-drain. In order to better understand these problems, the influence of temperature and moisture on sorption capacity of bituminous coal was investigated at ...
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The restructuring of the international coal industry
The international coal industry is now becoming a global industry emerging from a history of production for national purposes and isolated regional markets. The participants in the market are also changing; the oil companies have come and gone and production is now in the hands of specialist mining companies. This has implications for the way the industry is organised. Deregulation in the ...
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Methane De-Gassing in a Coal Mine
Aardvark Packers are used in coal mines to enhance operations and safety. They are used to de-gas, vent and direct methane gas away from new mine faces prior to mining to ensure as safe work environment. A typical 4-1/2” diameter hole in the face or in the ribs will be drilled. Sometimes, gel is injected into the borehole to isolate the gas. An Aardvark inflatable packer is inserted into ...
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Europe’s Largest Mine Gas Plant
GE Jenbacher has supplied 14 cogeneration systems to Europe’s largest coal mine gas plant, Fenne, which is owned by SaarEnergie and located in the district of Fenne near Saarbrücken, Germany, GE Energy announced at Hannover Messe 2004. The JMS 620 GS cogeneration systems produce more than 40 megawatts of electricity and nearly 41 megawatts of thermal energy. This coal mine gas plant ...
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Memory effect on hydrate formation and influential factors of its sustainability in new hydrate–based coal mine methane separation method
This paper describes an experimental study on the memory effect in a methane–in–water system in which a hydrate was once formed and then dissociated. The 'memory effect' is found to be associated with gas hydrate nucleation. This study aims to investigate how memory effect in the hydrate nucleation process depends on the thermal and kinetic history (i.e., the nucleation pressure and temperature, ...
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Planning the future of Botswana's coal
Botswana has vast proven deposits of steam coal, which, for a long time, the government has wanted to develop but without much success. The main objectives of this study are: to forecast possible coal exports from Botswana and the land routes for these exports; to determine the competitiveness of Botswana's coal in world steam coal trade; to make recommendations on the appropriate policy for the ...
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Development of algae–based technology to mitigate energy crisis in coal mining areas: a critical review
Algal biofuels around the world represent a sustainable pathway to meet increasing demand for fuel and clean energy with reduced environmental impact. More than half of that mass consists of lipids or triacylglycerides which are also found in vegetable oils and are used to produce such advanced biofuels as biodiesel, green diesel, green gasoline and green jet fuel. Algal remediation technology ...
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Comparison of employment potential of the coal and wind power industries
Australia, one of the world's largest producers of coal, is used as a case study to compare the employment potential in the coal and wind power electricity generation industries. It is revealed that, as a result of automation, employment in the coal mining industry fell by 45% between 1987 and 2002. Moreover, as a result of the restructuring of the electricity industry as a whole, employment in ...
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Power generated from methane gas in disused mines in England
Type HOFGAS®-IPM/C 2500 Performance 2’500 Nm³/h / 520mbar dP Location England (GB) Situation Mine gas is released when coal is extracted. This gas is sourced not only from working coal mines but also from those that were closed down long ago. Because large quantities of coal remain in the mine after it has ceased production, mine gas is released afterwards. The high proportion of ...
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Coal Prices held back for power producers in China
China requests that coal miners not raise prices Higher coal prices would increase price of inflation on all things in China, so the Govt. has asked that the Coal Companies keep prices from rising too much… The prices for coal set by annual supply contracts cannot be changed. All of the state run coal mine operators and coal industry leaders will work together coal prices steady. The ...
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Use of reconstituted waters to evaluate effects of elevated major ions associated with mountaintop coal mining on freshwater invertebrates
In previous laboratory chronic 7‐d toxicity tests conducted with the cladoceran Ceriodaphnia dubia, surface waters collected from Appalachian sites impacted by coal mining have shown toxic effects associated with elevated total dissolved solids (TDS). The objective of the present study was to evaluate the effects of elevated major ions in chronic laboratory tests with C. dubia (7‐d exposure), ...
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The international coal industry: comments on the paper by David Humphreys and Keith Welham
This comment discusses in more detail one of the primary messages in the paper by David Humphreys and Keith Welham, namely the fundamental shift in the steam coal industry away from security of supply concerns and national focuses towards an international and cost-driven perspective. On the supply side, this has meant an increased focus on mining productivity. By consulting recent research, this ...
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Ghost Series AB-200 x 20’ Enclosed Flare - Case Study #170302
PROJECT DETAILS Location: Somerset, CO Heat Capacity: 18.4 MMBTU/hr Inlet Pressure (ΔP): 6” WC Heating Value: ~300 BTU/SCF AB-200: 490 MSCFD Carbon Credits: $6000/ day Installed Year: 2017 Aereon’s Ghost series enclosed flare is pictured here on a Coal Bed Methane operation in Somerset Colorado. Harmful Methane was being vented to the atmosphere from an abandoned ...
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